What will continue to be ______ it is today--next in importance to oxygen?A、how

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问题 What will continue to be ______ it is today--next in importance to oxygen?

选项 A、how
B、which
C、what
D、as

答案 C

解析关系代词what在这里引导一个名词性从句做to be的表语，同时what在表语从句中又为is的表语成分。其他选项均不能表示这种语法关系。

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______theheattoasimmerandcontinuetocookforanother8-10minutesorunt